Abstract
A dynamic vibration absorber is usually used in order to achieve more efficient vibration control in case which damping devices are not directly installed to a primary system as like high rise buildings, bridges and pole like structures. A secondary system which has a spring and dash pot as dynamic absorber is put together with the primary mass, and the parameters of stiffness and damping should be arranged in optimal by using the Fixed-point theory. On the other hand, the author proposed a unique type of damper that has a changeable inertia mass effect by MR fluid in previous study. The effect of inertia mass, which is proportional to relative acceleration acting as a series inertia mass to objective, can make a natural frequency of the primary system lower and also have anti-resonance point at cut-off frequency. If the series inertia mass could be artificially varied, then it would be easy to control it. In this paper for the purpose of application to dynamic absorber, it is focused on how to apply the changeable series inertia mass into dynamic absorber, and what advantage is. An optimal parameters were determined by using conventional method as F-p theory at first, and then introduce the way how to switch the series inertia mass. Finally the advantage of inertia effect was investigated numerically.
